Mars has only about 1% of earth’s atmosphere. Curiosity’s parachute slowed it from about 1000mph to 200mph - before releasing the rover to land on rockets. With the mass needed for a manned landing you’d need a parachute the size of a stadium. You’d be hitting the ground by the time it fully opened.

The alternative landing method, from the ‘Wile E. Coyote’ school of interplanetary flight, uses giant air pillows to cushion a very bouncy landing. I don’t know of any astronaut that would like to be landed in bubble wrap, like a FedEx parcel.

That’s what the Pathfinder, Spirit and Opportunity rovers used. It wasn’t used for Curiosity because Curiosity is much larger and the airbag system didn’t scale up well.

Also the system used heat shields AND parachutes AND rockets AND air bags. And like Curiosity;s sky crane, a separate throw-away lander with it’s own power and computer and other systems to control it all. There was some valid criticism over how complicated it was.